* gnu/packages/haskell.scm (ghc-contravariant): New variable.
---
gnu/packages/haskell.scm | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 3da23eb..e71149a 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -2588,6 +2588,33 @@ parts of the OpenGL state.")
(description "Bifunctors")
(license bsd-3)))
+(define-public ghc-contravariant
+ (package
+ (name "ghc-contravariant")
+ (version "1.3.3")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append
+ "http://hackage.haskell.org/package/contravariant/contravariant-";
+ version
+ ".tar.gz"))
+ (sha256
+ (base32
+ "184hcmhsznqrkmqlc1kza9pb5p591anva574ry8wrh81vqmhwfb5"))))
+ (build-system haskell-build-system)
+ (propagated-inputs
+ `(("ghc-void" ,ghc-void)
+ ("ghc-transformers-compat" ,ghc-transformers-compat)
+ ("ghc-statevar" ,ghc-statevar)))
+ (inputs
+ `(("ghc-semigroups" ,ghc-semigroups)))
+ (home-page
+ "http://github.com/ekmett/contravariant/";)
+ (synopsis "Contravariant functors")
+ (description "Contravariant functors for Haskell.")
+ (license bsd-3)))
+
(define-public ghc-semigroups
(package
(name "ghc-semigroups")
--
2.6.1
